Finding the Fourth Proportional to 2,613.94, 3,913.89 and 1,378.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.94 : 3,913.89 = 1,378.78 : x
2. Step 2: Convert to fraction form
   2,613.94/3,913.89 = 1,378.78/x
3. Step 3: Cross multiply
   2,613.94x = 3,913.89 × 1,378.78
4. Step 4: Simplify right side
   2,613.94x = 5,396,393.25
5. Step 5: Solve for x
   x = 5,396,393.25/2,613.94
6. Step 6: Final answer
   x = 2,064.47